Electrical welding.



T. E. MURRAY.

ELECTRICAL WELDING.

APPLICATLON FILED DEC. 10,1915.

1 172,302. Patented Feb. 22, 1916.

4 SHEETSSHEET 1.

T. E. MURRAY.

ELECTRICAL WELDING.

APPLICATION FILED DEC. IQ. I9I5- 7 1,172,302. Patented Feb.22,1916.

4 SHEETS-SHEET 2.

5 noewfoz T. E. MURRAY.

ELECTRICAL WELDING.

APPLICATION FILED 050101915.

1,172,302. Patented Feb. 2;, 191%}.

4 SHEETS SHEET P.

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T. E. MURRAY.

ELECTRICAL WELDING.

APPLICATION FILED DEC.10,1915. 1 172,302 Patented Feb. 22, 1916.

4 SHEETSSHEET 4.

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c Jvwm vtoz THOMAS E. MURRAY, OF NEW YORK, N. Y.

Specification of Letters Patent.

ELECTRICAL WELDING.

Patented Feb. 22, 1916.

Application filed December 10, 1915. Serial No. 66,063.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residingat New York, in the'county of New York and State of New York, have invented a certain new and useful Improvement in Electrical \Velding, of which the following is a specification. p

The invention relates to electrical welding, and consists in the construction of the machine, hereinafter set forth. The objects to be welded are placed between electrodes, one of which is a roller carried by an arm on a rotary and longitudinally movable shaft. Means are provided for moving said shaft downwardly to cause said roller to press upon the-objects, while at the same time said shaft is rotated to cause the roller to move in a circular path upon the surface of the upper of the two objects. The welding is then performed incrementally as the roller moves over its path, or at successive spots if one of the objects be provided with projections on which the other object bears, thus localizing the said spotsg In the accompanying drawings Figure 1 is a front elevation of myowelding machine. Fig. 2 is a vertical'section .on line 2, 2 of Fig. 1. Fig. 3 is a section on the line 3, 3 of Fig. 1. 4 is a top View. Fig. 5 is a section on the line 5, 5 of Fig. 2. Fig. 6 is a section on the line 6, 6 of Fig. 2. Figs. 7 and 8 are perspective views, showing the mode of connecting the frame members, and Fig. 9 is a plan and Fig. 10 a cross section of two circular plates to be welded together, showing the projections on one of said plates. I

Similar letters and numbers of reference indicate like parts.

The frame of the machine is constructed as follows: A is a rectangular base frame, which rests on the floor. Two uprights B and C are bolted to the rear. and two uprights D, E to the front of said frame. The

front uprights -D. E are also connected at their lower ends by across girder F. At

their tops, the uprights B. C. D. E are bolted to a rectangular frame G, similar to frame A. A second girder H also extends between uprights D, E. and is bolted thereto. The said girder is recessed and notched, as shown at I, Fig. 7 to receive" the notched flanges of a girder J which is secured to a cross girder K, Fig.2, bolted to rear uprights B,

C. In Fig. 7, the girders H and J are shown separated at their joint, and in Fig. 8 they are shown put together. Upon the girder J above the joint is placed a block 11 of metal, and above said block is a plate 12 of insulating material. On said plate rests a plate 13 of metal which is integral with a bus-bar 14 which extends rearwardly and is secured by an insulatedbolt 15, Fig. 2,- ,to the cross girder K. Above plate 13 is a circular block 16.o f metal. Screw bolts 17 pass through girder J plate 11, from which they are insulated by the usual insulating bushings shown in Fig. 1, plate 12, plate 13 and block 16, thus securing said parts together. Block 16 is the lower welding electrode.

L is a vertical shaft received in a journal box formed in two parts 18, 19, bolted together. The part 18 of said box at its upper portion has a plate 20 cast integral with it, which plate extends over the front member of frame G. An angle plate 21 of insulating material. rests on said frame and extendsunder plate 19 and between the front tangular frame G, insulating angle plate 21 andplate 20 are secured together by bolt 22, insulated from said member. The lower portion of part 18 of the journal box' is bolted to the upwardly bent end of a busbar 23 whichis bolted to said rectangular frame G and insulated therefrom, as shown at 24, Fig. 2.

The shaft L extends downwardly through the journal box and carries at its lower end a block 25', from which extends a radial shaft 26, on'which shaft is mounted the roller 27. Abovethe block 25 said shaft passes through a spacing plate 28, and above said plate has fast to it a ring 29, Fig. 1,

which carries rollers 30 which rest on the top of a bar 31. to which are fastened vertical-rods 32. 'A rock shaft'33l pivoted in lugs 34 bolted to the rectangular frame F carries bell crank levers 35. The rods 32 are connected tothe front arms of said le- 'vers, and said'arms carry a foot treadle 36.

The rear arms of said' levers carry a counter weight 37. i

On the upper'part of shaft L is aipinion upon the top rectangular frame Gr. Said shaft 41 also carries a driving pulley 46. Two fingers 47 extendfrom the brackets 42, 43 and terminate above pinion 38 to prevent upward displacement thereof.

The operation of the machine is as follows: The objects to be welded, here two plates X, Y, are placed one above the other on the lower electrode 16. One of said plates may have projections Z upon it, as shown in Figs. 9 and 10, the other plate then resting upon said projections. The foot treadle 36 is then pushed down, and in this way the roller electrode 27 is mechanically pressed upon said plateswhile at the same time the welding current passes from one bus-bar, as 23, to the roller electrode 27, so through the plates X, Y, to bus-bar 14. By reason of the rotation of the shaft L the roller electrode 27 is caused to move in a circular path upon the upper plate X, so that the current passes through successive increments of thepl'ates,

if the projections be not present, or through said projections Z successively, if they be present. In the one case, a continuous circular weld is made, having a Width determined by the width of the circumferential periphery 47, Fig. 3, of roller 27. In the other case, spot welds are formed at each projection Z.

I claim: I g

l. A welding machine,'comprising two electrodes, one of said electrodes being a roller, means for moving said roller electrode in a closed curvilinear path, and means for varying the distance between said electrodes.

2. A welding machine, comprising two electrodes, one of said electrodes being a and, means for sliding said shaft to move said roller with relation to the other electrode.

4. A welding machine, comprising a frame, two electrodes, one of said electrodes being a roller, a rotary slidable shaft, a shaft bearing mounted on said frame, a pinion on said shaft, a worm engaging said pinion, an arm on said shaft carryingsaid roller, and means for sliding said shaft in its bearing to move said roller with relation to the other electrode.

5. A Welding machine, comprising two electrodes, one of said electrodes being a roller, a rotary shaft carrying said roller, a

cross bar receiving said shaft and bearing upon a shoulder thereon above said roller, a fixed ring on said shaft above said cross bar, rollers in said ring bearing upon said bar, and treadle mechanism connected to said cross bar for raising and lowering said shaft. In testimony whereof I have aflixed my signature in presence, of two witnesses.

THOMAS MURRAY.

Witnesses:

GERTRUDE T. PORTER,

MAY T. MoGARRY. 

